a.56.1 Tons
b.55.9 Compressor KW
c.10.7 Unit EER
4.Calculate Compressor kW at 50 Tons:
kW = 56.150 x55.9kW = 49.8kW
5. Calculate GPM:
(50Tons) ⋅ 24
10°FRange
6. From page ____, read 6 ft of water cooler pressure
drop from GPM:
7. A YCAL0061 is suitable.
EXAMPLE - BRINE CHILLING
Example - Brine Chilling
1.Given: Provide a capacity of 34 tons cooling 30% by weight Ethylene Glycol from 50 F to 40 F, 0.00025FF, 95 F air on the condenser, 60 Hz and 4000 ft. alti- tude.
2.Determine:
a.Unit Size
b.KW Input
c.Ethylene Glycol GPM
d.Cooler Pressure Drop
3.See E.G. correction factors, for 30% by weight E.G.
READ: 0.984 Tons Factor 0.997 Compr. KW factor
26.1Gal,/ F/Tons Factor
4.See Performance Data Correction Factors for 0.00025 fouling factor and 4,000 ft. altitude.
READ: 0.975 Tons factor 1.012 kW factor
5.From RATINGS on page 16. SELECT: YCAL0045 (English Units)
35.3Tons
41.1Compressor kW
6.Determine YCAL0045 brine cooling capacity and Compressor kW requirement from pg 14:
a.TONS: = 35.3 x 0.984 x 0.975 = 33.87
b.Compr. KW = 41.1 x 0.997 x 1.012 = 41.77
7.Determine average full load Compressor kW at 34 tons
34tons x(41.77) = 41.93CompressorkW
33.87tons
8. Determine E.G. GPM:
GPM = Tons ⋅ Gal.°F / min/ Tonfactor
Range
GPM = 34.0 ⋅ 26.1 = 88.7(GPM) 10
9. Determine Cooler Pressure Drop:
a.See E.G. correction factors for 30% by weight E.G.
READ: 1.258 Pressure Drop factor
b.See page 14 at 88.7 GPM for YCAL0045 READ: 6.5_Water H2O PD
c.Cooler Pressure Drop = 6.5 x 1.258 or 8.17 A YCAL0045 is suitable.
12 | YORK INTERNATIONAL |
